7.7      Bond angle in PH_{4}^{+} is higher than that in PH_{3}. Why?

Answers (1)

As we can see Both are  sp^3  hybridised. In PH_4^+ all of the 4 orbitals are bonded whereas in PH_3 there is a lone pair of electrons on P.this  lone pair is responsible for lone pair-bond pair repulsion in PH_3 , which results in reducing the bond angle to less than 109° 28′.

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